boy toy

noun Slang: Usually Disparaging.

Also toy boy. a young man noted for his good looks and sexual prowess, especially one who maintains relationships with older, more powerful persons.
a female sex object.

Origin of boy toy

First recorded in 1985–90

This term is usually used with disparaging intent. But it can also be used playfully or affectionately, as when referring to one's lover.

This same outlet worked the phrase “engagement to toyboy lover” into the headline of their article on Fry.
Freaking Out About Age Gaps in Gay Relationships Is Homophobic
Samantha Allen
January 9, 2015